Cylindrical balanced gate-valve



No. 616,724. Patented Dec. 27, I898. T. A. NOBLE.

CYLINDRICAL BALANCED GATE VALVE.

(Application filed Apr. 27, 1897.)

2 Sheets-Sheet I.

(No Model.)

k 4 f J A K 0 I L r O3 1 z l W/ m /.1- 1 I 1| Iifi INK a 1 A T7'0RNE rs. v

m: NORRIS PETERS 00., PHOTMln-KL, WASNINGTON. n. r.

N0. 6|6,724. Patented Dec. 27, I898. T. A. NOBLE. CYLINDRIOAL BALANCED GATE VALVE.

(Application filed Apr. 27, 1897.)

2 Sheets Sheet 2.

(No Model.)

A TTOHNE rs.

THE norms PEYERS ca, PNGTQ-LITHD., wuumem. u. c.

NITED STATES PATENT Enron.

CYLINDRICAL BALANCED GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 616,724, dated December 27, 1898.

Application filed April 27, 1897- I Seattle, in the county of King and State of Washington, have invented a new and Improved Oylindrical Balanced Gate -Valve, of which the following is a full, clear, and exact description. 7

The object of the invention is to provide a new and improved cylindrical balanced gatevalve which is simple and durable in construction and arranged to form an uninterrupted passage for the water when the valve is opened, the valve being perfectly balanced, so as to operate with ease under any pressure.

The invention consists of certain parts and details and combinations of the same, as will be fully described hereinafterand then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding partsin all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a sectional plan view of the same on the line 2 2 of Fig. 1. Fig. 3 is a sectional side elevation of the improvement, showing a modified form and means for opening and closing the valve. Fig. at is a reduced sectional plan view of part of the same on the line 4: 4 of Fig. 3, and Fig. 5 is a plan view of a modified form of mechanism for raising and lowering the gate by hand-power.

The valve-casin g A, as illustrated in Figs. 1 and 2, is made cylindrical and is provided at its reduced inlet end A with'a valve-seat B, bolted or otherwise fastened to the said inlet A. The valve-casingAis also provided with a reduced outlet A extending from the side of the casing either to the right or left, as indicated in full and dotted lines in Fig. 1. The valve-seat B is formed with the cylindrical inlet B, fitting into the inlet A, and formed at its upper edge with an annular valve-seat B preferably beveled, as shown, and adapted to be engaged by the correspondingly-shaped valve edge 0- of the cylindrical valve-gate C, extending within the casing A in such a manner as to be completely free to move upward and downward in the casing without .coming in contact with the walls thereof. On the upper end of this valve-gate C is formed an internal beveled valve-seat G Serial No. 634,092. (No model.)

engaging the correspondingly-shaped annular seat B formed on the base end of an inverted cone B supported on radial ribs 13, extending from the inlet B and integral with the same and. the cone B Now by the arrangement described the valve-gate G when in a closed position is seated on the valveseats 13 and B of which one engages the lower edge of the valve-gate and the other an internal annular seat located a suitable distance above the seat 13 Furthermore, the ribs B extend with their outer edges upwardly into the casing A, so as to engage the inner surface of the cylindrical valve-gate O to form a guide for the latter in its up-anddown movement.

The top edge of the cylindrical valve-gate O is provided with a dome C having apertures C to permit Water to pass on both sides of the dome,- and in the apex end of the dome is formed a socket O in which is secured the lower end D of the valve-stem D, made hollow and fitted to slide in a suitable stuffingbox E, attached to the cover A of the valvecasing A. On the upper end of the stem 1) is secured a piston F, fitting into a cylinder G, open at its lower end and connected at its upper end by a pipe H with a suitable source of pressure-supply, the said pipe being provided with a three-way valve (not shown) for connecting the pipe with the pressure-supply or with the open air. Now when the valvegate 0 is open and it is desired to close the same the said three-way valve is shifted to connect the supply with the cylinder G to allow water under pressure to pass into the cylinder and act on the piston F therein to force the piston downward, with the valvegate 0, to its seats. The pressure in the cylinder G is the same as the pressure in the valve, and the area of the cylinder being larger than the area of the plunger D it is evident that the piston, stem D, and gate 0 are forced down until thevalve is closed. When it is desired to open the main valve, the three-way valve in the pipe H is turned to cut off the supply and to connect the pipe with the outlet. The pressure in the Too moves the valve-gate G into an open position. \Vhen the valve-gate C is closed, the seats on the gate are pushed against the valve-seats B B thus forming a water-tight joint at each end of the valve-gate 0. As the latter is cylindrical and as the two seats forming the joints are of the same size, or nearly so, all pressure against the faces of the sliding valvegate 0 when the latter is closed is balanced. Thus no more power is required to open the valve than that required to ot er-come the friction against the sliding surfaces. The hollow valve-stem or plunger D, as shown in Fig. 1, is of considerable area, so that the pressure on the plunger will readily open the valve when the cylinder is connected with the atmosphere.

The valve-gate C, Fig. 1, may be connected with a solid valve-stem extending through a stuffing-box at E, with a thread cut on its outer edge for engaging in a hand-wheel or by other suitable means for operating said valvegate 0 by hand-power instead of by hydraulic power, as shown.

In the arrangement shown in Fig. 3 the valve-gate is provided with lugs 0 within the casing A and on the said lugs C are secured the valve-stems D fitted to slide in stuffing-boxes E, held externally on the outlet A of the casing. The upper ends of the valve-stems D are connected'with pistons F, fitted to slide in cylinders G, connected at the bottom and top with pressure-supply pipes I and J for forcing the pistons F upward or downward in the cylinders to open and close the gate-valve O by hydraulic power. The valve-seat B is the same as described relative to Fig. 1, and the valve-gate C is similar to the valve-gate 0, previously mentioned, so that further description of the said parts is not deemed necessary.

As shown in Fig. 5, a hand-power mechanism may be employed for raising and lowering the valve-gate, and for this purpose I provide the outer ends of the valve-stems D with beveled gear-wheels K in mesh with beveled gear-wheels K, secured on the shafts K standing at right angles one to the other and carrying gear-wheels K in mesh With the beveled gear-wheel K, secured on a shaft K formed with a polygonal offset or end K for applying a crank-arm or other tool to turn the shaft K so as to impart a simultaneous turning motion to the shafts K and the stems D provided at their outer ends with the beveled gear-wheels K previously mentioned. Thus by turning the shaft K in either direction the valve-gatecan be opened or closed.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A device of the class described, comprisin g a cylindrical casing having a reduced inlet at its lower end, a valve-seat having a cylindrical inlet portion fitting within the inlet end of the casing and formed at its lower end with a flan go by which it is secured to the valve-casing, the said valve-seat extending directly upward into the casin g and formed with two annular valve-seats, a cylindrical gate-valve adapted to be seated on the said valve-seats and located directly above and in alinement with the inlet-opening of the valvecasing, and means for raising and lowering said valve, substantially as shown and described.

2. A device of the class described, comprisin g a valve-casin g having a reduced inlet and outlet, a valve-seat having a cylindrical inlet portion fitted within the inlet of the easin g and having a flange adapted to be secured to the valve-casing, the said cylindrical inlet portion being formed at its upper edge with an annular beveled seat, radial ribs extending from the cylindrical inlet, a top carried 'by the ribs and formed with an annular beveled seat on its upper outer edge, a cylindrical gate-valve arranged within the casing and having guided movement on said ribs, the lower edge of said gate-valve being shaped to fit the beveled edge of the seat-inlet, the said gate-valve having an upper annular beveled seaton its internal surface for engaging the seat on the said top, and means for raisin g and lowering said gate-valve, substantially as shown and described.

3. The combination with a valve-casing provided with a valve-seat, of a cylinder open at one end, a piston adapted to reciprocate in said cylinder, a plunger having considerable area, and connected at one end with said piston and passing through a stufling-box into the valve-casing the area of the said cylinder being larger than the area of the plunger, a cylindrical gate-valve connected with the said plunger and arranged tobe seated on the said valve-seat, the said valve being so constructed that the pressure against its faces when closed is balanced, and a pipe adapted to connect the closed end of the cylinder with either the pressure or the atmosphere, whereby when the closed end of the cylinder is in communication with the atmosphere, the pressure of the supply against the plunger will open the valve and when the closed end of the cylinder is connected with the supply the pressure in the cylinder acting on the piston will seat the valve, substantially as set forth.

TIIERON A. NOBLE.

\Vitnesses:

PHILIP H. AMMIDows, CHARLES E. REMsBEnG. 

